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39．Ant Forest is a popular mobile app_____ allows people to plant real trees in the desert by collecting “green energy points’’. A．what 【答案】D 【解析】 【详解】
蚂蚁森林是一款允许人们通过收集绿色能量在沙漠里种植真的树木的流行的手机应用软件。
考查定语从句。本句为定语从句，先行词是a popular mobile app指物，关系词用which，故选D。
B．who
C．whom
D．which
40．Children like stories _______have happy endings, and so do many old people. A．who 【答案】B 【解析】 【详解】
句意：孩子们喜欢有美满结局的故事，许多老人也是。who引导定语从句，修饰人；which引导定语从句，修饰事物；what引导名词性从句。此处修饰先行词stories的定语从句，修饰事物，故用关系代词which引导定语从句。故选B。
B．which
C．what